Defaults vs personalization

I love defaults, it's the least (zero) work, and if something goes wrong, I google the issue and I'm sure to find the generic fix, which is not made more complex due to some personalization.

Sure, defaults are boring, I don't mind. But more importantly, defaults can be less secure and/or less efficient. Generally speaking, I will do some personalization because of the former, but not because of the latter, I gladly live with infrequent inefficiencies.

What do you think?
What do you personalize?
What do you leave at their defaults?

Good question.

What do I think and do? I leave it as is. Why? I really just use an OS to run programs/apps and the way it comes from MS is good enough for my needs. Customizing it would be a waste of time for me. Others love to customize and I say, go for it.

The only reg hack I do is to use the previous photo viewer. Other than that I leave everything alone. By doing that the odds of my messing things up are less
My 2c

I leave my system at defaults. The only customizing I do is setting the dark theme. But I don't think you can call that customizing anyway.

I don't leave anything alone!
Every new Build is a chain saw massacre here!